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raven.utils.stacks
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:copyright: (c) 2010-2012 by the Sentry Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
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Returns context_lines before and after lineno from file.
Returns (pre_context_lineno, pre_context, context_line, post_context).
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f_locals is not guaranteed to have .get(), but it will always
support __getitem__. Even if it doesn't, we return ``default``.
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